Table IV.

Susceptibility profile of E. coli (n = 363) isolated from patients of different age groups.

Antibiotics	19–74 years (n = 133)		75–85 years (n = 134)		> 85 years (n = 96)		75–85 years vs. 19–74 years		> 85 years vs. 19–74 years
	n’	% susc.	n’	% susc.	n’	% susc.	OR (95% CI)	p-value	OR (95% CI)	p-value
Ampicillin	132	31.1%	130	26.9%	92	33.7%	0.82 (0.48–1.40)	0.461	1.13 (0.64–1.99)	0.678
AM/CL	133	49.6%	133	51.1%	95	48.4%	1.06 (0.66–1.72)	0.806	0.95 (0.56–1.61)	0.858
PIP/TZ	73	86.3%	80	85.0%	54	90.7%	0.90 (0.36–2.23)	0.819	1.56 (0.50–4.85)	0.446
Amikacin	74	90.5%	83	81.9%	54	94.4%	0.47 (0.18–1.24)	0.127	1.78 (0.44–7.21)	0.422
Gentamicin	72	88.9%	85	89.4%	54	96.3%	1.06 (0.38–2.89)	0.916	3.25 (0.66–15.97)	0.147
Cefalexin	70	74.3%	78	75.6%	49	93.9%	1.07 (0.51–2.26)	0.849	5.31 (1.47–19.19)	0.011
Cefuroxime	132	85.6%	133	82.0%	93	91.4%	0.76 (0.40–1.47)	0.421	1.79 (0.75–4.28)	0.193
Cefotaxime	83	81.9%	95	85.3%	60	96.7%	1.28 (0.58–2.83)	0.548	6.40 (1.40–29.14)	0.017
Ceftazidime	83	80.7%	94	81.9%	60	90.0%	1.08 (0.51–2.31)	0.839	2.15 (0.79–5.87)	0.136
Cefepime	73	84.9%	82	87.8%	55	98.2%	1.28 (0.51–3.21)	0.602	9.58 (1.20–76.64)	0.033
Ciprofloxacin	132	72.0%	134	67.9%	95	71.6%	0.82 (0.49–1.39)	0.471	0.98 (0.55–1.76)	0.949
Norfloxacin	133	62.4%	132	59.1%	95	58.9%	0.87 (0.53–1.43)	0.581	0.86 (0.50–1.48)	0.598
Cotrimoxazole	130	74.6%	133	67.7%	95	75.8%	0.71 (0.42–1.22)	0.215	1.06 (0.58–1.97)	0.841
Imipenem	57	100.0%	74	100.0%	48	100.0%	–	–	–	–
Nitrofurantoin	132	91.7%	131	87.8%	94	88.3%	0.65 (0.29–1.47)	0.303	0.69 (0.28–1.66)	0.402

Abbrevations: Amoxicillin/clavulanic acid = AM/CL, Piperacillin/Tazobactam = PIP/TZ

n’ – number of all determinations for a given antibiotic; % susc. – % susceptibility